Waste heat recovery equipment for coal-fired boiler of thermal power plant

Abstract

The utility model relates to the technical field of waste heat recovery equipment, and provides waste heat recovery equipment for a coal-fired boiler of a thermal power plant, which comprises a water storage tank, a heat exchange pipe and a water pump, a heat exchange piece is arranged on the water storage tank, an air inlet pipe is arranged on one side of the heat exchange piece, an exhaust port is arranged on the other side of the heat exchange piece, the heat exchange pipe is arranged in the heat exchange piece, and the water pump is arranged in the heat exchange pipe. One end of the heat exchange pipe communicates with the water pump through a conveying pipe, the water pump communicates with the water storage tank, the other end of the heat exchange pipe communicates with the interior of the water storage tank through a backflow pipe, a cleaning mechanism used for cleaning the surface of the heat exchange pipe is arranged in the heat exchange piece, and a collecting box used for collecting scale is arranged in the heat exchange piece. The collecting box is arranged at the bottom of the heat exchange part, an opening is formed in one side of the heat exchange part, and the collecting box is connected with the opening in a sliding mode. By means of the technical scheme, a worker can conveniently collect scale and clean the scale.

Description

TECHNICAL FIELD

[0001] The utility model relates to preheating recovery equipment technical field, specifically, relate to a coal fired boiler waste heat recovery equipment of thermal power plant. BACKGROUND

[0002] The boiler is a kind of energy conversion equipment, the energy input into the boiler has chemical energy in fuel, electric energy, the boiler exports steam with certain heat energy, high temperature or organic heat carrier, therefore, the use of boiler is more extensive.For the waste heat recovery of boiler is part of the operation process of boiler, can recycle and reuse part of heat in boiler.

[0003] The existing boiler waste heat recovery device, including water storage tank, the upper surface of water storage tank is provided with heat exchange element, the left side of heat exchange element is provided with air inlet pipe, the inside of air inlet pipe is provided with first filter screen, the right side of first filter screen is provided with second filter screen, auxiliary air blower is installed on the right side of second filter screen, the upper surface of heat exchange element is installed with cleaning motor, the output shaft of cleaning motor is connected with lead screw, the outer wall of lead screw is connected with cleaning element, the inner wall of cleaning element is provided with cleaning brush.The cleaning motor is set, lead screw is rotated, under the cooperation of guide rod, cleaning element is vertically moved, and cleaning brush is driven to clean the outer wall of heat exchange tube.

[0004] Although the above-mentioned related technology can reduce the scale formed on the surface of heat exchange tube to cause adverse effects on heat transfer, but in actual use process, when the cleaning brush cleans the scale on the surface of heat exchange tube, the scale will fall in the inside of heat exchange element and gradually accumulate around the heat exchange tube, which may reduce heat transfer, so that the staff needs to clean regularly.In the above-mentioned related technology, the heat exchange tube is arranged in the inside of heat exchange element, which is inconvenient for the staff to collect scale and clean. UTILITY MODEL CONTENTS

[0005] The utility model provides a coal fired boiler waste heat recovery equipment of thermal power plant, and it is convenient for staff to collect scale and clean.

[0006] The technical scheme of the utility model is as follows: a coal fired boiler waste heat recovery equipment of thermal power plant, including water storage tank, heat exchange tube, water pump, the water storage tank is equipped with heat exchange element, one side of heat exchange element is equipped with air inlet pipe, the other side of heat exchange element is equipped with exhaust port, the heat exchange tube is arranged in heat exchange element, one end of heat exchange tube is communicated with water pump through delivery pipe, the water pump is communicated with water storage tank, the other end of heat exchange tube is communicated with the inside of water storage tank through backflow pipe, the inside of heat exchange element is equipped with cleaning mechanism for cleaning the surface of heat exchange tube, the inside of heat exchange element is equipped with collecting tank for collecting scale, and the collecting tank is arranged at the bottom of heat exchange element, one side of heat exchange element is equipped with opening, and the collecting tank is slidably connected with opening.

[0007] Further, the two sides of the collecting box are respectively provided with positioning blocks, the inner walls of the two sides of the heat exchange element are respectively provided with positioning grooves, and the positioning blocks are slidably connected with the inner walls of the positioning grooves.

[0008] Further, the side, away from the heat exchange element, of the collecting box is provided with a plurality of elastic elements, one end of each of the elastic elements is fixedly connected with the collecting box, the other end of each of the elastic elements is fixedly connected with a pressing block, the side, close to the elastic elements, of the heat exchange element is rotationally connected with a pressing plate through a rotating column, the pressing plate abuts against the side, away from the elastic elements, of the pressing block, a fixing bolt is threadedly connected with the pressing plate, and one end of the fixing bolt abuts against the surface of the water storage tank.

[0009] Further, the cleaning mechanism comprises a rotating motor and a sliding assembly, the sliding assembly comprises a cleaning block, a cleaning brush, a connecting rod, a rotating shaft and a rotating disc, the cleaning block is arranged in the heat exchange element and slidably connected with the inner wall of the heat exchange element, the cleaning brush is arranged on the cleaning block and the bristles of the cleaning brush are in contact with the surface of the heat exchange pipe, the rotating motor is arranged on the side of the heat exchange element, the rotating shaft is arranged on the output end of the rotating motor and extends into the heat exchange element and rotationally connected with the inner wall of the heat exchange element, the rotating disc is arranged on the side, away from the rotating motor, of the rotating shaft and fixedly connected with the rotating shaft, one end of the connecting rod is rotationally connected with the rotating disc, and the other end of the connecting rod is rotationally connected with the cleaning block.

[0010] Further, the heat exchange element is internally provided with a guide rod, and the cleaning block is slidably connected with the guide rod.

[0011] Further, the side, away from the heat exchange element, of the collecting box is provided with a handle, a rubber sleeve is arranged on the handle, and anti-skid lines are arranged on the rubber sleeve.

[0012] Further, the opening is provided with a sealing gasket

[0013] The working principle and beneficial effects of the utility model are as follows:

[0014] When the cleaning mechanism is started by the staff, the water scale will automatically fall into the collecting box at the bottom of the heat exchange element under the action of the cleaning mechanism, when the water scale is accumulated to a certain amount, the staff can take out the collecting box through the opening arranged on the box body and clean the water scale in the collecting box. BRIEF DESCRIPTION OF DRAWINGS

[0015] The utility model will be further explained in detail in combination with the drawings and specific embodiments.

[0016] Figure 1 The utility model structure is shown Figure 1 ;

[0017] Figure 2 Structure diagram of the utility model Figure 2

[0018] Figure 3 Structure diagram of the utility model Figure 2 Enlarged diagram of A in the middle

[0019] Figure 4 Structure diagram of the utility model

[0020] Figure 5 Structure diagram of the utility model

[0021] Figure 6 Structure diagram of the utility model

[0022] Figure 7 Structure diagram of the utility model Figure 6 Enlarged diagram of B in the middle

[0023] In the figure: 1, water storage tank; 101, heat exchange pipe; 102, water pump; 103, heat exchange element; 104, air inlet pipe; 105, exhaust port; 106, conveying pipe; 107, return pipe; 2, collection tank; 201, opening; 2011, gasket; 202, positioning block; 203, positioning groove; 204, elastic element; 205, pressing block; 206, rotating column; 207, extrusion plate; 208, fixing bolt; 209, telescopic rod; 3, rotating motor; 301, cleaning block; 302, cleaning brush; 303, connecting rod; 304, rotating shaft; 305, rotating disc; 306, guide rod; 4, handle; 401, rubber sleeve; 5, first synchronous wheel; 501, second synchronous wheel; 502, synchronous belt. DETAILED DESCRIPTION

[0024] The technical scheme in the embodiments of the utility model will be described clearly and completely below in conjunction with the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by those skilled in the art without creative labor are involved in the protection scope of the utility model.

[0025] Reference Figures 1-7 ​The utility model provides a kind of coal-fired boiler waste heat recovery equipment of thermal power plant, including water storage tank 1, heat exchange pipe 101, water pump 102, water storage tank 1 is equipped with heat exchange piece 103, one side of heat exchange piece 103 is equipped with air inlet pipe 104, air inlet pipe 104 can be connected with the flue of boiler, the other side of heat exchange piece 103 is equipped with exhaust port 105, heat exchange pipe 101 is arranged in heat exchange piece 103, one end of heat exchange pipe 101 is communicated with water pump 102 by conveying pipe 106, water pump 102 is communicated with water storage tank 1, the other end of heat exchange pipe 101 is communicated with inside of water storage tank 1 by backflow pipe 107, when high-temperature flue gas in boiler enters inside heat exchange piece 103 by air inlet pipe 104, water pump 102 can be started, water pump 102 will extract heat exchange liquid inside water storage tank 1, and flow into inside heat exchange pipe 101 by conveying pipe 106, high-temperature flue gas will heat transfer to heat exchange liquid in heat exchange pipe 101, and make it gradually warm, and the heat exchange liquid after warming will re-enter water storage tank 1 by backflow pipe 107 to carry out next cycle.

[0026] Heat exchange piece 103 is equipped with cleaning mechanism for cleaning the surface of heat exchange pipe 101, heat exchange piece 103 is equipped with collection tank 2 for collecting scale, and collection tank 2 is arranged at the bottom of heat exchange piece 103, one side of heat exchange piece 103 is equipped with opening 201, collection tank 2 is slidably connected with opening 201, sealing pad 2011 can be arranged at opening 201 to ensure the sealing property of inside heat exchange piece 103.

[0027] When the staff starts the cleaning mechanism, the scale will automatically fall into the collection tank 2 at the bottom of the heat exchange piece 103 under the action of the cleaning mechanism when the collection tank 2 is arranged, and the staff can pull out the collection tank 2 through the opening 201 arranged on the tank body when the scale accumulates to a certain amount and clean the scale therein. The staff can conveniently collect and clean the scale, and the heat exchange efficiency of the heat exchange piece 103 is improved. To facilitate the staff to pull out the collection tank 2, a handle 4 is arranged on the side of the collection tank 2 away from the heat exchange piece 103, a rubber sleeve 401 is arranged on the handle 4, and anti-skid lines are arranged on the rubber sleeve 401. Through the handle 4,

[0028] In addition, to facilitate the staff to install the collection tank 2, positioning blocks 202 are arranged on both sides of the collection tank 2, positioning grooves 203 are arranged on the inner walls of both sides of the heat exchange piece 103, and the positioning blocks 202 are slidably connected with the inner walls of the positioning grooves 203. Through the positioning blocks 202 and the positioning grooves 203, the staff only needs to correctly correspond the positioning blocks 202 with the grooves, and then easily pushes the collection tank 2 into the heat exchange piece 103 to complete the installation, which greatly reduces the time for adjustment and repeated installation and improves the installation efficiency of the staff.

[0029] Further, the collecting box 2 is provided with a plurality of elastic members 204 away from one side of the heat exchange element 103, the elastic member 204 can be selected from a cylindrical compression spring, and one end of the plurality of elastic members 204 is fixedly connected with the collecting box 2, the other end of each elastic member 204 is fixedly connected with a pressing block 205, a telescopic rod 209 (which can be telescopic) can be arranged between the pressing block 205 and the collecting box 2, and the elastic member 204 is sleeved on the telescopic rod 209, which can prevent the elastic member 204 from being deviated or misaligned when stressed, thereby improving the service life of the elastic member 204, the heat exchange element 103 is rotatably connected with a pressing plate 207 through a rotating column 206 away from one side of the elastic member 204, the pressing plate 207 abuts away from one side of the pressing block 205, the pressing plate 207 is threadedly connected with a fixing bolt 208, and one end of the fixing bolt 208 abuts the surface of the water storage tank 1.

[0030] When the staff pushes the collecting box 2 into the heat exchange element 103, one side of the pressing plate 207 needs to be rotated around the rotating column to make the side surface in close contact with the side surface of the pressing block 205, and the elastic member 204 is compressed. Then, the bolt needs to be tightened to make one side in contact with the surface of the water storage tank 1, and the friction force is used to fix the pressing plate 207 to prevent it from rotating or moving. Once the pressing plate 207 is fixed, one side of the elastic member 204 in the compressed state will push the side of the collecting box 2 to make it in close contact with the opening 201 of the heat exchange element 103, thereby improving the sealing performance of the heat exchange element 103 and ensuring its stability during work.

[0031] In addition, the pressing plate 207 can be slidably connected with the surface of the sliding column, and the pressing plate 207 can move on the surface of the sliding column, so that the staff can control the elastic force of the elastic member 204 to make the connection between the collecting box 2 and the opening 201 of the heat exchange element 103 more closely, and the stability of the heat exchange element 103 can be further improved.

[0032] Specifically, the cleaning mechanism includes a rotating motor 3 and a sliding assembly, the sliding assembly includes a cleaning block 301, a cleaning brush 302, a connecting rod 303, a rotating shaft 304, and a rotating disc 305, the cleaning block 301 is arranged in the heat exchange element 103 and slidably connected with the inner wall of the heat exchange element 103, the cleaning brush 302 is arranged on the cleaning block 301, and the bristles of the cleaning brush 302 are in contact with the surface of the heat exchange pipe 101, the rotating motor 3 is arranged on the side of the heat exchange element 103, the rotating shaft 304 is arranged on the output end of the rotating motor 3 and fixedly connected with the output end, and the rotating shaft 304 extends into the heat exchange element 103 and rotatably connected with the inner wall of the heat exchange element 103, the rotating disc 305 is arranged on the side of the rotating shaft 304 away from the rotating motor 3 and fixedly connected with the rotating shaft 304, one end of the connecting rod 303 is rotatably connected with the rotating disc 305, and the other end of the connecting rod 303 is rotatably connected with the cleaning block 301 (it should be noted that the length of the connecting rod 303 is greater than the radius of the rotating disc 305).

[0033] When the staff needs to clean the scale on the surface of the heat exchange pipe 101, the rotating motor 3 can be started, and the output end of the rotating motor 3 drives the rotating disc 305 to rotate clockwise through the rotating shaft 304. When the rotating disc 305 rotates clockwise, the rotating disc 305 drives the cleaning block 301 to move up and down along the inner wall of the heat exchange part 103 through the connecting rod 303 (the longer the distance that the cleaning block 301 wants to move, the farther the rotating point of the connecting rod 303 and the rotating disc 305 can be set from the side of the rotating disc 305 away from the water storage tank 1), so that the cleaning brush 302 cleans the surface of the heat exchange pipe 101, and the scale on the surface falls into the collecting tank 2. In order to prevent the cleaning block 301 from deviating or misplacing during movement, a guide rod 306 can be arranged inside the heat exchange part 103, and the cleaning block 301 is in sliding connection with the guide rod 306. The guide rod 306 can limit the movement track of the cleaning block 301, so that it can only move up and down along the direction of the guide rod 306. It can prevent the cleaning block 301 from deviating or misplacing during movement, improve the stability of the movement of the cleaning block 301, and ensure the uniformity of the cleaning of the cleaning brush 302, and improve the cleaning effect.

[0034] By arranging the sliding assembly, only the rotating motor 3 needs to rotate in one direction to realize the up-and-down movement of the cleaning brush 302, without the need for the motor to frequently rotate forward and reverse. This can reduce the wear and tear inside the motor, thereby prolonging the service life of the rotating motor 3 and reducing costs. In addition, this design can ensure the continuity of the up-and-down movement of the cleaning brush 302, thereby improving the cleaning effect.

[0035] In order to improve the cleaning effect, another sliding assembly can be arranged on the top of the heat exchange part 103, and the two sliding assemblies can be connected through the synchronous belt 502 wheel set. However, the rotating point of the rotating disc 305 and the connecting rod 303 in the sliding assembly arranged on the top of the heat exchange part 103 is arranged on the side of the rotating disc 305 close to the water storage tank 1. In this way, when the rotating motor 3 rotates clockwise, the cleaning blocks 301 in the two sliding assemblies will move downward and upward along the guide rods 306 respectively, so that the cleaning brush 302 cleans the surface of the heat exchange pipe 101.

[0036] The synchronous belt 502 wheel set comprises a first synchronous wheel 5 and a second synchronous wheel 501, the first synchronous wheel 5 is arranged on the rotating shaft 304 and fixedly connected with the rotating shaft 304, the second synchronous wheel 501 is arranged on the rotating shaft 304 in the other sliding assembly and fixedly connected with the rotating shaft 304, the first synchronous belt 502 wheel and the second synchronous wheel 501 are connected through the synchronous belt 502. When the rotating motor 3 rotates clockwise, the output end of the rotating motor 3 drives the rotating disc 305 to rotate clockwise through the rotating shaft 304, when the rotating disc 305 rotates clockwise, since the rotating point of the connecting rod 303 and the rotating disc 305 is arranged on the side of the rotating disc 305 away from the water storage tank 1, the cleaning block 301 will be driven to move downward through the connecting rod 303. At the same time, the first synchronous belt 502 wheel will rotate clockwise under the driving of the rotating shaft 304, the first synchronous belt 502 wheel will drive the second synchronous wheel 501 to rotate clockwise through the synchronous belt 502, so as to drive the rotating disc 305 in the other sliding assembly to rotate clockwise, since the rotating point of the rotating disc 305 and the connecting rod 303 is arranged on the side of the rotating disc 305 close to the water storage tank 1, the cleaning block 301 in the sliding assembly arranged on the top of the heat exchange element 103 will move upward first, so as to clean the surface of the heat exchange pipe 101.

[0037] Working principle:

[0038] When the worker needs to clean the scale on the surface of the heat exchange pipe 101, the rotating motor 3 can be started, the output end of the rotating motor 3 drives the rotating disc 305 to rotate clockwise through the rotating shaft 304, when the rotating disc 305 rotates clockwise, the rotating disc 305 drives the cleaning block 301 to move up and down along the inner wall of the heat exchange element 103 through the connecting rod 303, so that the cleaning brush 302 cleans the surface of the heat exchange pipe 101, and the scale on the surface falls into the collecting tank 2.

[0039] When the scale in the collecting tank 2 accumulates to a certain degree, the worker can loosen the bolt, so that the extrusion plate 207 is in a rotatable state, then the extrusion plate 207 is fixed on the side of the heat exchange element 103 through the bolt, so as to prevent it from falling automatically under the influence of gravity, when the extrusion plate 207 is fixed, the worker can pull out the collecting tank 2 by holding the handle 4, and clean the scale in the collecting tank 2.

[0040] When the cleaning is completed, the workers only need to correspond the positioning block 202 with the groove correctly, then easily push the collecting box 2 into the groove, the installation is completed, then need to operate one side of the extrusion plate 207 to rotate around the rotating column, so that the side surface of the extrusion plate 207 is in close contact with the side surface of the pressing block 205, the elastic member 204 is compressed. Then, the bolt is tightened, one side of the bolt is in contact with the surface of the water storage tank 1, the extrusion plate 207 is fixed by using the friction force, the rotation or movement of the extrusion plate 207 is prevented. Once the extrusion plate 207 is fixed, one side of the elastic member 204 in the compressed state pushes the side surface of the collecting box 2, so that the collecting box 2 is in close connection with the opening 201 of the heat exchange member 103, the sealing performance of the inside of the heat exchange member 103 is improved, the stability of the heat exchange member 103 during the work is ensured.

[0041] The above only is the preferred embodiment of the utility model, and does not limit the utility model, and any modification, equivalent replacement, improvement etc. that is made within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A coal-fired boiler waste heat recovery device for a thermal power plant, comprising a water storage tank (1), a heat exchange pipe (101), and a water pump (102), wherein the water storage tank (1) is provided with a heat exchange element (103), one side of the heat exchange element (103) is provided with an air inlet pipe (104), and the other side of the heat exchange element (103) is provided with an air outlet (105), characterized in that, The heat exchange pipe (101) is arranged in the heat exchange piece (103), one end of the heat exchange pipe (101) is communicated with the water pump (102) through the conveying pipe (106), the water pump (102) is communicated with the water storage tank (1), the other end of the heat exchange pipe (101) is communicated with the inside of the water storage tank (1) through the return pipe (107), the heat exchange piece (103) is provided with a cleaning mechanism for cleaning the surface of the heat exchange pipe (101), the heat exchange piece (103) is provided with a collection tank (2) for collecting water scale, and the collection tank (2) is arranged at the bottom of the heat exchange piece (103), one side of the heat exchange piece (103) is provided with an opening (201), and the collection tank (2) is slidably connected with the opening (201).

2. A coal-fired boiler waste heat recovery device for a thermal power plant according to claim 1, characterized in that: Both sides of the collection tank (2) are provided with positioning blocks (202), and the inner walls of both sides of the heat exchange piece (103) are provided with positioning grooves (203), and the positioning blocks (202) are slidably connected with the inner walls of the positioning grooves (203).

3. A coal-fired boiler waste heat recovery device for a thermal power plant according to claim 1, characterized in that: The side, away from the heat exchange piece (103), of the collection tank (2) is provided with a plurality of elastic members (204), one end of each of the plurality of elastic members (204) is fixedly connected with the collection tank (2), the other end of each of the elastic members (204) is fixedly connected with a pressing block (205), the side, close to the elastic members (204), of the heat exchange piece (103) is rotationally connected with a pressing plate (207) through a rotating column (206), the pressing plate (207) abuts against the side, away from the elastic members (204), of the pressing block (205), and the pressing plate (207) is threadedly connected with a fixing bolt (208), and one end of the fixing bolt (208) abuts against the surface of the water storage tank (1).

4. A coal-fired boiler waste heat recovery device for a thermal power plant according to claim 1, characterized in that: The cleaning mechanism comprises a rotating motor (3) and a sliding assembly, the sliding assembly comprises a cleaning block (301), a cleaning brush (302), a connecting rod (303), a rotating shaft (304) and a rotating disc (305), the cleaning block (301) is arranged in the heat exchange piece (103) and slidably connected with the inner wall of the heat exchange piece (103), the cleaning brush (302) is arranged on the cleaning block (301), and the bristles of the cleaning brush (302) are in contact with the surface of the heat exchange pipe (101), the rotating motor (3) is arranged on the side of the heat exchange piece (103), the rotating shaft (304) is arranged on the output end of the rotating motor (3) and rotationally connected with the inner wall of the heat exchange piece (103), the rotating disc (305) is arranged on the side, away from the rotating motor (3), of the rotating shaft (304) and fixedly connected with the rotating shaft (304), one end of the connecting rod (303) is rotationally connected with the rotating disc (305), and the other end of the connecting rod (303) is rotationally connected with the cleaning block (301).

5. A coal-fired boiler waste heat recovery device for a thermal power plant according to claim 4, characterized in that: The heat exchange piece (103) is internally provided with a guide rod (306), and the cleaning block (301) is slidably connected with the guide rod (306).

6. A coal-fired boiler waste heat recovery device for a thermal power plant according to claim 1, characterized in that: The side, away from the heat exchange piece (103), of the collection tank (2) is provided with a handle (4), the handle (4) is provided with a rubber sleeve (401), and the rubber sleeve (401) is provided with anti-skid lines.

7. A coal-fired boiler waste heat recovery device for a thermal power plant according to claim 1, characterized in that: The opening (201) is provided with a sealing gasket (2011).

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